WO2011030453A1 - 衝撃吸収構造 - Google Patents
衝撃吸収構造 Download PDFInfo
- Publication number
- WO2011030453A1 WO2011030453A1 PCT/JP2009/065996 JP2009065996W WO2011030453A1 WO 2011030453 A1 WO2011030453 A1 WO 2011030453A1 JP 2009065996 W JP2009065996 W JP 2009065996W WO 2011030453 A1 WO2011030453 A1 WO 2011030453A1
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- WIPO (PCT)
- Prior art keywords
- strength
- deformation
- shock absorbing
- deformation control
- control unit
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
- B62D21/152—Front or rear frames
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
Definitions
- the present invention relates to an impact absorbing structure that absorbs an impact.
- a structure in which a plurality of beads are formed at the corners of a front side member is known (for example, see Patent Document 1).
- This shock absorbing structure has a reinforcing wall portion between a plurality of beads of the front side member. By having such a configuration, the shock absorbing structure can absorb a shock at the time of a collision.
- the above-described shock absorbing structure is required to stabilize the compressive deformation in the axial direction of the shock absorbing member such as the front side member, and to further improve the shock absorbing performance.
- An object of the present invention is to provide a shock absorbing structure that can stabilize the compressive deformation in the axial direction of a shock absorbing member and improve the performance of shock absorption.
- the shock absorbing structure includes a shock absorbing member extending from one end side to the other end side, and a plurality of first deformation controls that are formed on the shock absorbing member and control deformation of the shock absorbing member by adjusting strength. And a plurality of second deformation control units that are formed on the shock absorbing member and control the deformation of the shock absorbing member by adjusting the strength.
- a plurality of second deformation control units are arranged at predetermined intervals along the longitudinal direction, and the plurality of first deformation control units are arranged at a predetermined interval along the longitudinal direction. At least one is arranged between the parts, and the plurality of first deformation control parts includes a set that is configured to have higher strength as it is arranged on the other end side in the longitudinal direction. To do.
- At least one first deformation control unit is disposed between the pair of second deformation control units. That is, the first deformation control unit and the second deformation control unit are arranged alternately at least.
- the strength of the first deformation control unit is weakened to facilitate deformation, and the strength of the second deformation control unit is increased to make deformation difficult.
- the impact absorbing member can be deformed into a bellows shape when an impact acts in the longitudinal direction.
- the first deformation control unit is configured to have higher strength as it is disposed on the other end side in the longitudinal direction. Therefore, the shock absorbing member can be deformed in order from one end side. As described above, the axial compressive deformation of the shock absorbing member is stabilized, and the shock absorbing performance is improved.
- the first deformation control unit is formed with a first strength adjustment unit for adjusting the strength so as to extend in a direction intersecting the longitudinal direction
- the second deformation control unit has a strength.
- the second strength adjusting portion for adjusting the length is formed so as to extend in the longitudinal direction.
- the first deformation control unit is formed with a first strength adjustment unit that adjusts the strength
- the second deformation control unit is formed with a second strength adjustment unit that adjusts the strength.
- the first effective cross-sectional length is determined by the length of the portion excluding the first strength adjusting unit among the plurality of sides of the cross-sectional shape of the first deformation control unit, and the plurality of cross-sectional shapes of the second deformation control unit Of the sides
- the second effective cross section length is determined by the length of the portion excluding the second strength adjusting section, and the first effective cross section length and the second effective cross section length are set to be different from each other
- the first deformation control section Preferably includes a set having a large first effective cross-sectional length as it is arranged on the other end side in the longitudinal direction.
- the first effective sectional length and the second effective sectional length are set to be different from each other. Accordingly, the first deformation control unit and the second deformation control unit can have different strengths.
- the first deformation control unit includes one having a larger effective sectional length as it is disposed on the other end side in the longitudinal direction. Therefore, the shock absorbing member can be deformed in order from one end side. As described above, the axial compressive deformation of the shock absorbing member is stabilized, and the shock absorbing performance is improved.
- the first deformation control unit is formed with a bead, whereby a first strength adjusting unit for adjusting strength is formed, and the second deformation control unit is formed with a bead.
- a first strength adjusting unit for adjusting strength is formed
- the second deformation control unit is formed with a bead.
- the first deformation control unit preferably has a lower strength than the deformation non-control unit excluding the first deformation control unit and the second deformation control unit among the shock absorbing members. . Therefore, when an impact is applied from one end side of the impact absorbing member, the stress in the first deformation control unit locally increases. The first deformation control unit undergoes plastic buckling and out-of-plane deformation. Thereby, when an impact acts in the longitudinal direction of the impact absorbing member, the impact absorbing member can be deformed into a bellows shape.
- the second deformation control unit has higher strength than the deformation non-control unit, and the first deformation control unit is adjacent to the second deformation control unit in the longitudinal direction. It is preferable that it is arrange
- the first deformation control unit having a low strength is disposed adjacent to the second deformation control unit having a high strength. As a result, a portion where the strength rapidly changes is formed in the shock absorbing member. Therefore, when an impact acts in the longitudinal direction of the impact absorbing member, the impact absorbing member can be deformed into a bellows shape at a portion where the strength changes rapidly. As described above, the axial compressive deformation of the shock absorbing member is stabilized, and the shock absorbing performance is improved.
- the shock absorbing member is formed by welding a plurality of members, and it is preferable that a welded portion between the members is formed in the second deformation control unit.
- the welded portion can increase the strength in the second deformation control portion. Thereby, the compressive deformation in the axial direction of the shock absorbing member can be further stabilized.
- An impact absorbing structure includes an impact absorbing member that extends from one end side to the other end side, a plurality of first deformation control units that are formed on the impact absorbing member and control deformation of the impact absorbing member, and the impact absorbing member
- a plurality of second deformation control units that control deformation of the shock absorbing member, and the plurality of first deformation control units are arranged at predetermined intervals along the longitudinal direction of the shock absorbing member.
- the plurality of second deformation control units are arranged at predetermined intervals along the longitudinal direction, and the first deformation control unit is arranged at least one by one between the pair of second deformation control units,
- the first deformation control unit is formed with a first strength adjusting unit that controls the deformation of the shock absorbing member so as to extend in a direction intersecting the longitudinal direction, and the second deformation control unit controls the deformation of the shock absorbing member.
- the second strength adjusting portion is formed to extend in the longitudinal direction. And said that you are.
- At least one first deformation control unit is disposed between the pair of second deformation control units. That is, the first deformation control unit and the second deformation control unit are arranged alternately at least.
- the strength of the first deformation control unit is weakened to facilitate deformation, and the strength of the second deformation control unit is increased to make deformation difficult.
- the impact absorbing member can be deformed into a bellows shape when an impact acts in the longitudinal direction.
- the first strength adjusting portion such as a bead extends in a direction intersecting the longitudinal direction. Therefore, the first strength adjusting unit can effectively reduce the strength of the first deformation control unit.
- a second strength adjusting portion such as a bead extends in the longitudinal direction. Therefore, the second strength adjusting unit can effectively increase the strength of the second deformation control unit. As described above, the axial compressive deformation of the shock absorbing member is stabilized, and the shock absorbing performance is improved.
- An impact absorbing structure includes an impact absorbing member that extends from one end side to the other end side, a plurality of first deformation control units that are formed on the impact absorbing member and control deformation of the impact absorbing member, and the impact absorbing member And a plurality of second deformation control units that control deformation of the shock absorbing member, and the plurality of second deformation control units are arranged at predetermined intervals along the longitudinal direction of the shock absorbing member.
- the second deformation control unit has higher strength than the non-deformation control unit excluding the first deformation control unit and the second deformation control unit among the shock absorbing members. It is disposed adjacent to the second deformation control unit in the longitudinal direction of the shock absorbing member, and has a lower strength than the deformation non-control unit.
- the first deformation control unit having a low strength is disposed adjacent to the second deformation control unit having a high strength.
- a portion where the strength rapidly changes is formed in the shock absorbing member. Therefore, when an impact acts in the longitudinal direction of the impact absorbing member, the impact absorbing member can be deformed into a bellows shape at a portion where the strength changes rapidly. As described above, the axial compressive deformation of the shock absorbing member is stabilized, and the shock absorbing performance is improved.
- the axial compression deformation of the shock absorbing member can be stabilized and the shock absorbing performance can be improved.
- FIG. 1 is a perspective view of an impact absorbing structure according to the first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. 3 is a cross-sectional view taken along line III-III shown in FIG.
- FIG. 4 is a perspective view of the shock absorbing structure according to the second embodiment of the present invention.
- FIG. 5 is a perspective view of an impact absorbing structure according to the third embodiment of the present invention.
- FIG. 6 is a perspective view of an impact absorbing structure according to the fourth embodiment of the present invention.
- FIG. 7 is a perspective view of the shock absorbing structure according to the fifth embodiment of the present invention.
- FIG. 1 is a perspective view of an impact absorbing structure 100 according to the first embodiment of the present invention.
- the shock absorbing structure 100 is a vehicle body structure provided on the front side of the vehicle.
- the shock absorbing structure 100 has a function of absorbing a shock from the front of the vehicle body.
- the shock absorbing structure 100 is configured by adjusting the strength of the front end side of the front side member (shock absorbing member) 2.
- the positive direction of the X axis indicates the vehicle outer side
- the positive direction of the Y axis indicates the front side of the vehicle
- the positive direction of the Z axis indicates the upper side of the vehicle.
- the front side member 2 is a hollow member extending from the front end (one end) 2a to the rear end (other end) 2b.
- the front side member 2 has a function of absorbing an impact from the front of the vehicle.
- the front side member 2 includes a front side member outer 3 disposed on the vehicle outer side and a front side member inner 4 disposed on the vehicle inner side.
- the front side member outer 3 is a flat plate-like member extending in the longitudinal direction.
- the front side member inner 4 is a member obtained by bending a flat plate extending in the longitudinal direction.
- the front side member inner 4 includes a pair of flange portions 6, 7, an upper surface portion 8, a lower surface portion 9, a side surface portion 11, a slope portion 12, and a slope portion 13.
- the pair of flange portions 6 and 7 are joined to the front side member outer 3.
- the upper surface portion 8 extends horizontally from the upper flange portion 6 toward the inside of the vehicle.
- the lower surface portion 9 extends horizontally from the lower flange portion 7 to the vehicle inner side.
- the side part 11 extends vertically inside the vehicle.
- the inclined surface portion 12 connects the side surface portion 11 and the upper surface portion 8.
- the slope portion 13 connects the side surface portion 11 and the lower surface portion 9.
- the plate thickness of the front side member inner 4 is set to a value larger than Tmin obtained by the following formula (1).
- Tmin obtained by the following formula (1).
- E represents the Young's modulus of the material
- ⁇ represents the Poisson's ratio
- ⁇ y represents the yield strength
- b max represents the maximum side length of the cross section.
- the maximum side length indicates the length of the longest side in the cross-sectional shape of the front side member inner 4.
- the length of the cross-sectional shape of the side surface portion 11 of the front side member inner 4 (that is, the vertical width of the side surface portion 11) is the maximum side length.
- the front end of the front side member inner 4 is reinforced by attaching a reinforcing member 14 therein.
- a welded portion 21 that connects the flange portion 6 and the front side member outer 3 is formed at the front end portion of the front side member inner 4.
- a welded portion 21 that connects the flange portion 7 and the front side member outer 3 is formed at the front end portion of the front side member inner 4.
- the first high-strength portion 31 has a function of controlling the deformation of the front side member 2 by suppressing the deformation of the front side member 2.
- the width of the first high-strength portion 31 in the longitudinal direction of the vehicle is set to about 10 to 20 mm.
- the deformation non-control unit 30 is the first high-strength portion 31, the second high-strength portion 32, the third high-strength portion 33, the fourth high-strength portion 34, and the first low-strength portion of the front side member 2. 36, a portion excluding the second low-strength portion 37 and the third low-strength portion 38. In FIG.
- the second high-strength portion 32, the third high-strength portion 33, and the fourth high-strength portion 34 are shown in a thin satin pattern.
- the first low-strength portion 36, the second low-strength portion 37, and the third low-strength portion 38 are shown with a dark satin pattern.
- the second high-strength portion 32 is formed L (mm) behind the first high-strength portion 31 in the front side member inner 4. L is calculated
- the second high strength portion 32 has a higher strength than the deformation non-control portion 30.
- the second high-strength portion 32 has a function of controlling the deformation of the front side member 2 by suppressing the deformation of the front side member 2.
- the second high-strength portion 32 is set across the flange portion 6, the upper surface portion 8, the inclined surface portion 12, the side surface portion 11, the inclined surface portion 13, the lower surface portion 9, and the flange portion 7 in the vehicle vertical direction.
- the width of the second high strength portion 32 in the vehicle front-rear direction is set to 10 mm or less.
- the second high strength portion 32 is formed with a second strength adjustment portion 41 that increases the strength.
- the second strength adjusting portion 41 is configured by a plurality of beads extending in the longitudinal direction of the front side member 2.
- the bead constituting the second strength adjusting portion 41 has a length that fits within the width of the second high strength portion 32.
- the second strength adjusting portion 41 includes a bead formed on the slope portion 12 of the second high strength portion 32, a bead formed on the slope portion 13 of the second high strength portion 32, and a side surface portion of the second high strength portion 32.
- 11 is composed of two beads. These beads are recessed inward and extend in the longitudinal direction.
- a welded portion 22 for connecting to the front side member outer 3 is formed on the flange portion 6 of the second high strength portion 32.
- a welded portion 22 for connecting to the front side member outer 3 is formed on the flange portion 7 of the second high strength portion 32.
- a third high-strength portion 33 is formed L (mm) behind the second high-strength portion 32 in the front side member inner 4.
- the third high strength portion 33 has a higher strength than the deformation non-control portion 30.
- the third high-strength portion 33 has a function of controlling the deformation of the front side member 2 by suppressing the deformation of the front side member 2.
- the third high-strength portion 33 is set across the flange portion 6, the upper surface portion 8, the inclined surface portion 12, the side surface portion 11, the inclined surface portion 13, the lower surface portion 9, and the flange portion 7 in the vehicle vertical direction.
- strength part 33 is set to 10 mm or less.
- the third high strength portion 33 is formed with a second strength adjusting portion 42 for increasing the strength.
- the second strength adjusting portion 42 is configured by a plurality of beads extending in the longitudinal direction of the front side member 2.
- the bead constituting the second strength adjusting portion 42 has a length that fits within the width of the third high strength portion 33.
- the second strength adjusting portion 42 is a bead formed on the slope portion 12 of the second high strength portion 32, a bead formed on the slope portion 13 of the second high strength portion 32, and a side surface portion of the second high strength portion 32.
- 11 is composed of two beads. These beads are recessed inward and extend in the longitudinal direction.
- a welded portion 23 for connecting to the front side member outer 3 is formed on the flange portion 6 of the third high strength portion 33.
- a welded portion 23 for connecting to the front side member outer 3 is formed on the flange portion 7 of the third high strength portion 33.
- a fourth high-strength portion 34 is formed L (mm) behind the third high-strength portion 33 in the front side member inner 4.
- the fourth high strength portion 34 has a higher strength than the deformation non-control portion 30.
- the fourth high-strength portion 34 has a function of controlling the deformation of the front side member 2 by suppressing the deformation of the front side member 2.
- the fourth high-strength portion 34 is set across the flange portion 6, the upper surface portion 8, the inclined surface portion 12, the side surface portion 11, the inclined surface portion 13, the lower surface portion 9, and the flange portion 7 in the vehicle vertical direction.
- the width of the fourth high-strength portion 34 in the vehicle front-rear direction is set to 10 mm or less.
- the fourth high-strength portion 34 is formed with a second strength adjusting portion 43 that increases the strength.
- the second strength adjusting portion 43 is configured by a plurality of beads extending in the longitudinal direction of the front side member 2.
- the bead constituting the second strength adjusting portion 43 has a length that fits in the width of the fourth high strength portion 34.
- the second strength adjusting portion 43 includes a bead formed on the slope portion 12 of the second high strength portion 32, a bead formed on the slope portion 13 of the second high strength portion 32, and a side surface portion of the second high strength portion 32. 11 is composed of two beads. These beads are recessed inward and extend in the longitudinal direction.
- a welded portion 24 for connecting to the front side member outer 3 is formed on the flange portion 6 of the fourth high strength portion 34.
- a welded portion 24 for connecting to the front side member outer 3 is formed on the flange portion 7 of the fourth high strength portion 34.
- a first low-strength portion 36 is formed at a central position between the first high-strength portion 31 and the second high-strength portion 32 in the front side member inner 4.
- the first low-strength portion 36 has a lower strength against an impact from the vehicle front-rear direction than the deformation non-control portion 30.
- the first low strength portion 36 has a function of controlling the deformation of the front side member 2 by facilitating the deformation of the front side member 2.
- the first low-strength portion 36 has a shape in which stress concentration is likely to occur at the time of collision, and functions as a portion that becomes a vertex of deformation.
- the first low-strength portion 36 is set across the flange portion 6, the upper surface portion 8, the inclined surface portion 12, the side surface portion 11, the inclined surface portion 13, the lower surface portion 9, and the flange portion 7 in the vehicle vertical direction.
- the first low strength portion 36 is formed with a first strength adjusting portion 44 for reducing the strength.
- the first strength adjusting portion 44 is composed of a plurality of beads extending in a direction orthogonal to the longitudinal direction of the front side member 2.
- the first strength adjusting portion 44 is a corner portion between the upper surface portion 8 and the slope portion 12 of the first low strength portion 36, a corner portion between the lower surface portion 9 and the slope portion 13 of the first low strength portion 36,
- the first low-strength portion 36 includes a bead formed at a corner portion between the slope portion 12 and the side surface portion 11 and a corner portion between the slope portion 13 and the side surface portion 11 of the first low-strength portion 36.
- the These beads are recessed inward and extend in a direction perpendicular to the longitudinal direction.
- a second low-strength portion 37 is formed at the center position between the second high-strength portion 32 and the third high-strength portion 33 in the front side member inner 4.
- the second low strength portion 37 has a lower strength than the deformation non-control portion 30.
- the second low strength portion 37 has a higher strength than the first low strength portion 36.
- the second low strength portion 37 has a function of controlling the deformation of the front side member 2 by facilitating the deformation of the front side member 2.
- the second low-strength portion 37 has a shape in which stress concentration is likely to occur at the time of collision, and functions as a portion that becomes the apex of deformation.
- the second low-strength portion 37 is set across the flange portion 6, the upper surface portion 8, the inclined surface portion 12, the side surface portion 11, the inclined surface portion 13, the lower surface portion 9, and the flange portion 7 in the vehicle vertical direction.
- the second low strength portion 37 is formed with a first strength adjusting portion 45 for reducing the strength.
- the first strength adjusting portion 45 is configured by a plurality of beads extending in a direction orthogonal to the longitudinal direction of the front side member 2.
- the first strength adjusting unit 45 is configured by a bead shorter than the first strength adjusting unit 44.
- the first strength adjusting portion 45 is a corner portion between the upper surface portion 8 and the slope portion 12 of the first low strength portion 36, a corner portion between the lower surface portion 9 and the slope portion 13 of the first low strength portion 36,
- the first low-strength portion 36 includes a bead formed at a corner portion between the slope portion 12 and the side surface portion 11 and a corner portion between the slope portion 13 and the side surface portion 11 of the first low-strength portion 36.
- the These beads are recessed inward and extend in a direction perpendicular to the longitudinal direction.
- a third low-strength portion 38 is formed at the center position between the third high-strength portion 33 and the fourth high-strength portion 34 in the front side member inner 4.
- the third low strength portion 38 has a lower strength than the deformation non-control portion 30.
- the third low strength portion 38 has a higher strength than the second low strength portion 37.
- the third low-strength portion 38 has a function of controlling the deformation of the front side member 2 by facilitating the deformation of the front side member 2.
- the third low-strength portion 38 has a shape in which stress concentration is likely to occur at the time of collision, and functions as a portion that becomes the apex of deformation.
- the third low-strength portion 38 is set across the flange portion 6, the upper surface portion 8, the inclined surface portion 12, the side surface portion 11, the inclined surface portion 13, the lower surface portion 9, and the flange portion 7 in the vehicle vertical direction.
- the third low-strength portion 38 is formed with a first strength adjusting portion 46 for reducing the strength.
- the first strength adjusting portion 46 is configured by a plurality of beads extending in a direction orthogonal to the longitudinal direction of the front side member 2.
- the first strength adjusting unit 46 is configured by a bead shorter than the first strength adjusting unit 45.
- the first strength adjusting portion 46 is a corner between the upper surface portion 8 and the slope portion 12 of the first low strength portion 36, a corner portion between the lower surface portion 9 and the slope portion 13 of the first low strength portion 36,
- the first low-strength portion 36 includes a bead formed at a corner portion between the slope portion 12 and the side surface portion 11 and a corner portion between the slope portion 13 and the side surface portion 11 of the first low-strength portion 36.
- the These beads are recessed inward and extend in a direction perpendicular to the longitudinal direction.
- the strength of the low-strength portions 36, 37, and 38 is sequentially increased as they are arranged on the rear end 2b side in the longitudinal direction. That is, the strength of the low-strength portion is weaker as it is closer to the front end 2a, and the strength is higher as it is closer to the rear end 2b.
- each central position in the cross section of the upper surface portion 8, the lower surface portion 9, the side surface portion 11, the slope portion 12, and the slope portion 13 is a starting point for plastic buckling. . Therefore, it is preferable not to form a bead at the position.
- the low strength portion having the highest strength has a lower strength than the low strength portion having the lowest strength.
- FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG.
- FIG. 2 shows a cross-sectional shape of the first low strength portion 36.
- the cross-sectional shape of the first low strength portion 36 has a plurality of sides.
- the cross-sectional shape of the first low strength portion 36 is as follows: flange portion 6, flange portion 7, upper surface portion 8, lower surface portion 9, side surface portion 11, slope portion 12, slope portion 13, first strength adjustment portion. 44 and a side corresponding to the front side member outer 3.
- the effective sectional length SC1 of the first low-strength portion 36 is defined as a length obtained by removing the length of the side corresponding to the first strength adjusting unit 44 from the sum of the lengths of the sides constituting the cross-sectional shape.
- the effective sectional length SC1 is determined by the length of the alternate long and short dash line shown in FIG. In FIG. 2, an alternate long and short dash line is drawn at the center position of the thickness of the cross-sectional shape.
- the length of the side of the cross-sectional shape is determined based on the position. However, the length of the side of the cross-sectional shape may be determined based on the outer peripheral position or the inner peripheral position of the cross-sectional shape.
- the effective sectional length SC2 of the second low strength portion 37 and the effective sectional length SC3 of the third low strength portion 38 are determined by the same method as the effective sectional length SC1 of the first low strength portion 36.
- the first strength adjusting portion 45 of the second low strength portion 37 is shorter than the first strength adjusting portion 44 of the first low strength portion 36
- the first strength adjusting portion 46 of the third low strength portion 38 is the second low strength portion 36.
- the strength portion 37 is shorter than the first strength adjustment portion 45. Therefore, the relationship SC1 ⁇ SC2 ⁇ SC3 is established between the effective sectional lengths SC1, SC2 and SC3. That is, the low-strength portions 36, 37, and 38 have a larger effective sectional length as they are arranged on the rear end 2b side in the longitudinal direction.
- FIG. 3 is a cross-sectional view taken along line III-III shown in FIG.
- FIG. 3 shows the cross-sectional shape of the second high-strength portion 32.
- the cross-sectional shape of the second high-strength portion 32 has a plurality of sides.
- the cross-sectional shape of the second high-strength portion 32 includes the flange portion 6, the flange portion 7, the upper surface portion 8, the lower surface portion 9, the side surface portion 11, the inclined surface portion 12, the inclined surface portion 13, and the second strength adjusting portion. 41 and a side corresponding to the front side member outer 3.
- the effective sectional length SN of the second high-strength portion 32 is defined as a length obtained by removing the length of the side corresponding to the second strength adjusting portion 41 from the sum of the lengths of the sides constituting the cross-sectional shape. .
- the effective sectional length SN is determined by the length of the alternate long and short dash line shown in FIG. In FIG. 3, an alternate long and short dash line is drawn at the center position of the thickness of the cross-sectional shape.
- the length of the side of the cross-sectional shape is determined based on the position. However, the length of the cross-sectional shape may be determined based on the outer peripheral position or the inner peripheral position of the cross-sectional shape.
- the effective cross-sectional lengths of the third high-strength portion 33 and the fourth high-strength portion 34 are both SN.
- the effective sectional length SN of the high-strength portions 32, 33, 34 is set to be larger than any of the effective sectional lengths SC1, SC2, SC3.
- each of the low strength portions 36, 37, 38 undergoes plastic buckling and out-of-plane deformation.
- the out-of-plane deformation at the low-strength portions 36, 37, and 38 proceeds in the vehicle front-rear direction, but is received by the high-strength portions 31, 32, 33, and 34 with high strength.
- the front side member 2 is deformed into a bellows shape in a mode in which each of the high-strength portions 31, 32, 33, and 34 has a half wavelength.
- the front side member 2 uses the low strength portions 36, 37, and 38 as antinodes and the high strength portions 31, 32, 33, and 34 as nodes when an impact acts in the vehicle longitudinal direction. ) As a bellows shape. Furthermore, each low intensity
- the shock absorbing structure 100 As described above, in the shock absorbing structure 100 according to the first embodiment, the high-strength portions 31, 32, 33, and 34 and the low-strength portions 36, 37, and 38 are alternately arranged. Therefore, when an impact acts on the front side member 2 in the vehicle front-rear direction, the front side member 2 can be deformed into a bellows shape. Further, the strength of each of the low-strength portions 36, 37, and 38 is increased as the lower-strength portions 36, 37, and 38 are arranged on the rear end 2b side in the longitudinal direction. Accordingly, the front side member 2 can be deformed in order from the front end 2a side. As described above, the compressive deformation in the axial direction of the front side member 2 is stabilized, and the performance of absorbing shock is improved.
- the first strength adjusting portions 44, 45, 46 such as beads extend in a direction orthogonal to the longitudinal direction. Therefore, the first strength adjusting units 44, 45, 46 can effectively reduce the strength of the low strength portions 36, 37, 38.
- second strength adjusting parts 41, 42, 43 such as beads extend in the longitudinal direction. Therefore, the second strength adjusting units 41, 42, 43 can effectively increase the strength of the high strength units 31, 32, 33, 34. As a result, the compressive deformation in the axial direction of the front side member 2 is stabilized, and the shock absorbing performance is improved.
- the effective cross-sectional lengths of the low-strength portions 36, 37, and 38 and the effective cross-sectional lengths of the high-strength portions 31, 32, 33, and 34 are different from each other. Yes. Accordingly, the low strength portions 36, 37, and 38 and the high strength portions 31, 32, 33, and 34 are different in strength from each other.
- Each of the low-strength portions 36, 37, and 38 has a larger effective sectional length as it is disposed on the rear end 2b side in the longitudinal direction. Accordingly, the front side member 2 can be deformed in order from the front end 2a side. As described above, the compressive deformation in the axial direction of the front side member 2 is stabilized, and the performance of absorbing shock is improved.
- each of the low strength portions 36, 37, 38 has a lower strength than the deformation non-control portion 30. Therefore, when an impact is applied to the front side member 2 from the front of the vehicle, the stress in each of the low strength portions 36, 37, and 38 increases locally. Each low-strength portion 36, 37, 38 undergoes plastic buckling and out-of-plane deformation. Thereby, when an impact acts on the front side member 2 from the front of the vehicle, the front side member 2 can be deformed into a bellows shape.
- the welded portions 21 to 24 are formed in the high-strength portions 31, 32, 33, and 34, respectively.
- the welded portions 21 to 24 can increase the strength of the high-strength portions 31, 32, 33, and 34. Thereby, the compressive deformation of the front side member 2 in the axial direction can be further stabilized.
- FIG. 4 is a perspective view of the shock absorbing structure 200 according to the second embodiment of the present invention.
- the front side member inner 4 is indicated by a virtual line
- only the front side member outer 53 is indicated by a solid line.
- the shock absorbing structure 200 according to the second embodiment is mainly different from the shock absorbing structure 100 according to the first embodiment in that a bead is also formed on the front side member outer 53 side.
- the front side member 52 of the shock absorbing structure 200 includes a front side member inner 4 and a front side member outer 53.
- the front side member outer 53 includes flange portions 54 and 55, a side surface portion 56, and slope portions 57 and 58.
- beads extending in the vehicle front-rear direction are formed at the corner between the side surface portion 56 and the slope portion 57 and at the corner portion between the side surface portion 56 and the slope portion 58.
- the second intensity adjusting unit 61 is formed at the position.
- the second strength adjusting portion 61 is composed of a reinforcing bead formed on the side surface portion 56 and the slope portions 57 and 58. These beads are recessed inward and extend in the longitudinal direction.
- a second strength adjusting portion is formed by a reinforcing bead at a position corresponding to each of the high strength portions 32, 33, and 34.
- the position corresponding to the first low-strength portion 36 of the front side member inner 4 as viewed from the vehicle width direction has a low strength. That is, the first intensity adjusting unit 62 is formed at the position.
- the first strength adjusting portion 62 is configured by a bead for promoting deformation formed at a corner portion between the side surface portion 56 and the slope portion 57 and a corner portion between the side surface portion 56 and the slope portion 58. . These beads are recessed inward and extend in a direction perpendicular to the longitudinal direction.
- the first strength adjusting portion by the deformation promoting bead is formed at a position corresponding to each of the low strength portions 37 and 38.
- the strengths of the low-strength portions 36, 37, and 38 are further reduced. Moreover, the strength of each high-strength portion 31, 32, 33, 34 is further increased.
- FIG. 5 is a perspective view of an impact absorbing structure 300 according to the third embodiment of the present invention.
- the shock absorbing structure 300 according to the third embodiment is mainly different from the shock absorbing structure 100 according to the first embodiment in that a bulkhead 70 is provided in each high-strength portion 32, 33, 34. .
- the high-strength portions 32, 33, and 34 are not formed with beads extending in the longitudinal direction.
- a bulkhead 70 is disposed in the front side member 2 at each high-strength portion 32, 33, 34. Thereby, the strength of each of the high strength portions 32, 33, and 34 is increased. Therefore, when the impact acts on the front side member 2 from the front of the vehicle, the deformation of the high-strength portions 32, 33, and 34 is suppressed.
- FIG. 6 is a perspective view of an impact absorbing structure 400 according to the fourth embodiment of the present invention.
- the shock absorbing structure 400 according to the fourth embodiment is mainly different from the shock absorbing structure 100 according to the first embodiment in that the low-strength portions 86, 87, 88 are formed by heat treatment.
- each low-strength part 86, 87, 88 is subjected to heat treatment or the like. Accordingly, the strength of each of the low strength portions 86, 87, 88 is made lower than that of the deformation non-control portion 30.
- the second low strength portion 87 has higher strength than the first low strength portion 86
- the third low strength portion 88 has higher strength than the second low strength portion 87.
- the strength of each of the low strength portions 86, 87, 88 can be reduced without forming a bead. Note that the strength of each high-strength portion may be increased by heat treatment or the like.
- FIG. 7 is a perspective view of an impact absorbing structure 500 according to the fifth embodiment of the present invention.
- the shock absorbing structure 500 according to the fifth embodiment is mainly different from the shock absorbing structure 400 according to the fourth embodiment in that a low strength portion is formed at a position adjacent to the high strength portion.
- each high-strength part 91, 92, 93 is subjected to heat treatment.
- the strength of each of the high-strength portions 91, 92, 93 is significantly higher than that of the deformation non-control portion 30.
- the first low strength portion 94 and the second low strength portion 95 are formed at adjacent positions on both sides of the second high strength portion 91 in the vehicle front-rear direction.
- the third low strength portion 96 and the fourth low strength portion 97 are formed at adjacent positions on both sides of the third high strength portion 92 in the vehicle front-rear direction.
- the fifth low-strength portion 98 and the sixth low-strength portion 99 are formed at positions adjacent to both sides of the fourth high-strength portion 93 in the vehicle front-rear direction.
- the first low strength portion 94 is disposed between the first high strength portion 31 and the second high strength portion 91.
- the second low strength portion 95 and the third low strength portion 96 are disposed between the second high strength portion 91 and the third high strength portion 92.
- the fourth low strength portion 97 and the fifth low strength portion 98 are disposed between the third high strength portion 92 and the fourth high strength portion 93.
- each of the low strength portions 94 to 99 is made lower than that of the deformation non-control portion 30 by heat treatment or the like.
- the difference in strength between the third high-strength portion 92 and the low-strength portions 96 and 97 is made smaller than the difference in strength between the second high-strength portion 91 and the low-strength portions 94 and 95.
- the difference in strength between the fourth high-strength portion 93 and the low-strength portions 98 and 99 is made smaller than the difference in strength between the third high-strength portion 92 and the low-strength portions 96 and 97.
- the difference in strength between the high-strength portion and the low-strength portion is configured to be smaller as it is arranged on the rear end side.
- the strengths of the high-strength portions 91 to 93 are the same, the strength of the low-strength portions 94 to 99 is increased as the lower strength portions 94 to 99 are arranged on the rear end side.
- the front side member outer 3 also has a low-strength portion and a high-strength portion formed by heat treatment in the same manner as the front side member inner 4.
- the low strength portions 94 to 99 are disposed adjacent to the high strength portions 31, 91, 92, and 93. As a result, a portion where the strength rapidly changes is formed on the front side member 2. Therefore, when an impact acts on the front side member 2 from the front of the vehicle, the front side member 2 can be deformed into a bellows shape at a portion where the strength changes rapidly. As described above, the compressive deformation in the axial direction of the front side member 2 is stabilized, and the performance of absorbing shock is improved.
- the present invention is not limited to the embodiment described above.
- the strength of the low-strength portion is lowered by the bead.
- the strength of the low-strength portion may be reduced by a long hole.
- the shape of the front side member is not limited to the above-described embodiment.
- strength part is not limited to the above-mentioned embodiment.
- the strength of the low-strength portion is higher as the lower-strength portion is disposed on the other end side in the longitudinal direction.
- this relationship has only to be partially established among the plurality of low-strength portions depending on the position where deformation control is desired.
- a low-strength portion having higher strength than the low-strength portion may be disposed in front of the low-strength portion on the front end side having low strength.
- a plurality of patterns may be formed in the longitudinal direction of the front side member so that the imperial strength portion disposed on the other end side in the longitudinal direction has higher strength.
- the present invention can be used when improving shock absorption of a vehicle.
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Abstract
Description
図1は、本発明の第一実施形態に係る衝撃吸収構造100の斜視図である。衝撃吸収構造100は、車両の前側に設けられた車体構造である。衝撃吸収構造100は、車体の正面からの衝撃を吸収する機能を有している。衝撃吸収構造100は、フロントサイドメンバ(衝撃吸収部材)2の前端側の強度調節が行われることによって構成されるものである。なお、図1において、X軸の正の方向は車両外側を示し、Y軸の正の方向は車両前側を示し、Z軸の正の方向は車両上側を示している。
次に、図4を参照して本発明の第二実施形態に係る衝撃吸収構造200について説明する。図4は、本発明の第二実施形態に係る衝撃吸収構造200の斜視図である。図4では、フロントサイドメンバインナ4が仮想線で示されており、フロントサイドメンバアウタ53のみが実線で示されている。第二実施形態に係る衝撃吸収構造200は、フロントサイドメンバアウタ53側にもビードが形成されている点で、第一実施形態に係る衝撃吸収構造100と主に相違している。
次に、図5を参照して本発明の第三実施形態に係る衝撃吸収構造300について説明する。図5は、本発明の第三実施形態に係る衝撃吸収構造300の斜視図である。第三実施形態に係る衝撃吸収構造300は、各高強度部32,33,34にバルクヘッド70が設けられている点で、第一実施形態に係る衝撃吸収構造100と主に相違している。
次に、図6を参照して本発明の第四実施形態に係る衝撃吸収構造400について説明する。図6は、本発明の第四実施形態に係る衝撃吸収構造400の斜視図である。第四実施形態に係る衝撃吸収構造400は、各低強度部86,87,88が熱処理によって形成されている点で、第一実施形態に係る衝撃吸収構造100と主に相違している。
次に、図7を参照して本発明の第五実施形態に係る衝撃吸収構造500について説明する。図7は、本発明の第五実施形態に係る衝撃吸収構造500の斜視図である。第五実施形態に係る衝撃吸収構造500は、高強度部に隣接する位置に低強度部が形成されている点で、第四実施形態に係る衝撃吸収構造400と主に相違している。
Claims (9)
- 一端側から他端側へ延びる衝撃吸収部材と、
前記衝撃吸収部材に形成され、強度を調節することで当該衝撃吸収部材の変形を制御する複数の第一変形制御部と、
前記衝撃吸収部材に形成され、強度を調節することで当該衝撃吸収部材の変形を制御する複数の第二変形制御部と、を備え、
複数の前記第一変形制御部は、前記衝撃吸収部材の長手方向に沿って、所定の間隔で配置され、
複数の前記第二変形制御部は、前記長手方向に沿って、所定の間隔で配置され、
複数の前記第一変形制御部は、一対の前記第二変形制御部同士の間に、少なくとも一つずつ配置され、
複数の前記第一変形制御部は、前記長手方向の前記他端側に配置されているものほど、強度が高く構成されている組を含むことを特徴とする衝撃吸収構造。 - 前記第一変形制御部には、強度を調節する第一強度調節部が、前記長手方向と交差する方向に延びるように形成され、
前記第二変形制御部には、強度を調節する第二強度調節部が、前記長手方向に延びるように形成されていることを特徴とする請求項1記載の衝撃吸収構造。 - 前記第一変形制御部には、強度を調節する第一強度調節部が形成され、
前記第二変形制御部には、強度を調節する第二強度調節部が形成され、
前記第一変形制御部の横断面形状の複数の辺のうち、前記第一強度調節部を除く部分の長さによって第一有効断面長が定められ、
前記第二変形制御部の横断面形状の複数の辺のうち、前記第二強度調節部を除く部分の長さによって第二有効断面長が定められ、
前記第一有効断面長と前記第二有効断面長は、互いに異なるように設定され、
前記第一変形制御部は、前記長手方向の前記他端側に配置されているものほど、大きな前記第一有効断面長を有する組を含むことを特徴とする請求項1又は2記載の衝撃吸収構造。 - 前記第一変形制御部には、ビードが形成されることによって、強度を調節する第一強度調節部が形成され、
前記第二変形制御部には、ビードが形成されることによって、強度を調節する第二強度調節部が形成されることを特徴とする請求項1~3のいずれか一項記載の衝撃吸収構造。 - 前記第一変形制御部は、前記衝撃吸収部材のうち前記第一変形制御部及び前記第二変形制御部を除く変形非制御部に比して、低い強度を有することを特徴とする請求項1記載の衝撃吸収構造。
- 前記第二変形制御部は、前記変形非制御部に比して、高い強度を有し、
前記第一変形制御部は、前記第二変形制御部に対し、前記長手方向に隣接する位置に配置されていることを特徴とする請求項5記載の衝撃吸収構造。 - 前記衝撃吸収部材は、複数の部材を溶接することによって構成されており、
前記第二変形制御部には、前記部材同士の溶接部が形成されていることを特徴とする請求項1~6のいずれか一項記載の衝撃吸収構造。 - 一端側から他端側へ延びる衝撃吸収部材と、
前記衝撃吸収部材に形成され、当該衝撃吸収部材の変形を制御する複数の第一変形制御部と、
前記衝撃吸収部材に形成され、当該衝撃吸収部材の変形を制御する複数の第二変形制御部と、を備え、
複数の前記第一変形制御部は、前記衝撃吸収部材の長手方向に沿って、所定の間隔で配置され、
複数の前記第二変形制御部は、前記長手方向に沿って、所定の間隔で配置され、
前記第一変形制御部は、一対の前記第二変形制御部同士の間に、少なくとも一つずつ配置され、
前記第一変形制御部には、前記衝撃吸収部材の変形を制御する第一強度調節部が、前記長手方向と交差する方向に延びるように形成され、
前記第二変形制御部には、前記衝撃吸収部材の変形を制御する第二強度調節部が、前記長手方向に延びるように形成されていることを特徴とする衝撃吸収構造。 - 一端側から他端側へ延びる衝撃吸収部材と、
前記衝撃吸収部材に形成され、当該衝撃吸収部材の変形を制御する複数の第一変形制御部と、
前記衝撃吸収部材に形成され、当該衝撃吸収部材の変形を制御する複数の第二変形制御部と、を備え、
複数の前記第二変形制御部は、前記衝撃吸収部材の長手方向に沿って、所定の間隔で配置され、
前記第二変形制御部は、前記衝撃吸収部材のうち前記第一変形制御部及び前記第二変形制御部を除く変形非制御部に比して、高い強度を有しており、
前記第一変形制御部は、前記衝撃吸収部材の長手方向において前記第二変形制御部と隣接するように配置され、前記変形非制御部に比して低い強度を有することを特徴とする衝撃吸収構造。
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JP2011530710A JP5218662B2 (ja) | 2009-09-14 | 2009-09-14 | 衝撃吸収構造 |
PCT/JP2009/065996 WO2011030453A1 (ja) | 2009-09-14 | 2009-09-14 | 衝撃吸収構造 |
CN2009801610331A CN102483119B (zh) | 2009-09-14 | 2009-09-14 | 冲击吸收结构 |
EP09849231.7A EP2479452A4 (en) | 2009-09-14 | 2009-09-14 | DAMPING STRUCTURE |
US13/393,070 US8689955B2 (en) | 2009-09-14 | 2009-09-14 | Shock absorbing structure |
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US20140174867A1 (en) * | 2011-08-09 | 2014-06-26 | Nippon Steel & Sumitomo Metal Corporation | Shock absorbing member |
US20140191532A1 (en) * | 2011-08-09 | 2014-07-10 | Nippon Steel & Sumitomo Metal Corporation | Shock absorbing member |
US9228629B2 (en) * | 2011-08-09 | 2016-01-05 | Nippon Steel & Sumitomo Metal Corporation | Shock absorbing member |
US9381881B2 (en) * | 2011-08-09 | 2016-07-05 | Nippon Steel & Sumitomo Metal Corporation | Shock absorbing member |
JP2017535483A (ja) * | 2014-09-22 | 2017-11-30 | オートテック・エンジニアリング・アグルパシオン・デ・インテレス・エコノミコAutotech Engineering A.I.E. | 金属部品における制御された変形 |
JP2017043158A (ja) * | 2015-08-25 | 2017-03-02 | 本田技研工業株式会社 | 車体後部構造 |
KR20200092396A (ko) | 2017-12-26 | 2020-08-03 | 닛폰세이테츠 가부시키가이샤 | 충격 흡수 부재 |
US11530728B2 (en) | 2017-12-26 | 2022-12-20 | Nippon Steel Corporation | Impact absorbing member |
JP2021080978A (ja) * | 2019-11-18 | 2021-05-27 | 日本製鉄株式会社 | 棒体及び棒状構造体 |
JP7348507B2 (ja) | 2019-11-18 | 2023-09-21 | 日本製鉄株式会社 | 棒状構造体 |
Also Published As
Publication number | Publication date |
---|---|
CN102483119A (zh) | 2012-05-30 |
JPWO2011030453A1 (ja) | 2013-02-04 |
JP5218662B2 (ja) | 2013-06-26 |
US8689955B2 (en) | 2014-04-08 |
EP2479452A4 (en) | 2014-10-08 |
EP2479452A1 (en) | 2012-07-25 |
US20120152675A1 (en) | 2012-06-21 |
CN102483119B (zh) | 2013-11-20 |
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